I have questions about building a ramp that chickens will use to access their off-the-ground coop. (My chickens will be larger dual-purpose ones, if that matters. I don't have them yet, ) What is a good angle for the ramp? Is 45 degrees acceptable? Does it need to be lower? Could it be steeper? How long can a ramp between a raised coop and the ground be? Is there a length the chickens will decide isn't worth the bother? How wide should the ramp be? What about the "rungs"? The floor of the ramp will be solid, do the rungs need to be a certain size, or certain distance apart? Anything else I should know about the ramp part of the coop? Thanks in advance!